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closes #203
This commit is contained in:
Willi Ballenthin 2024-10-29 15:03:49 +00:00
parent 926d8d278e
commit a5e7b3190e
8 changed files with 0 additions and 761 deletions
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29
.github/workflows/Dockerfile vendored
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@ -1,29 +0,0 @@
# need to use manylinux2010 (not manylinux1) to deal with vsyscall issue:
# https://www.python.org/dev/peps/pep-0571/#compatibility-with-kernels-that-lack-vsyscall
FROM quay.io/pypa/manylinux2010_x86_64
ENV PATH /root/.cargo/bin:/usr/local/bin/:$PATH
# Add all supported python versions
ENV PATH /opt/python/cp36-cp36m/bin/:/opt/python/cp37-cp37m/bin/:/opt/python/cp38-cp38/bin/:/opt/python/cp39-cp39/bin/:$PATH
# Otherwise `cargo new` errors
ENV USER root
RUN curl https://sh.rustup.rs -sSf | sh -s -- -y \
&& rustup default stable \
&& python3 -m pip install --no-cache-dir cffi \
&& mkdir /io
RUN /opt/python/cp38-cp38/bin/python -m pip install --upgrade pip setuptools maturin
# rust cmake library needs cmake 3+
# manylinux/centos6 has cmake 2.8
RUN cd /tmp \
&& curl https://cmake.org/files/v3.12/cmake-3.12.3.tar.gz > cmake-3.12.3.tar.gz \
&& tar zxvf cmake-3.* > /dev/null \
&& cd cmake-3.* \
&& ./bootstrap --prefix=/usr/local \
&& make -j3 \
&& make install \
&& rm -rf /tmp/*
ENTRYPOINT ["/opt/python/cp38-cp38/bin/maturin"]

1
Cargo.toml
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@ -8,7 +8,6 @@ members = [
"flirt",
"pyflirt",
"pylancelot",
"jslancelot",
"bin",
]

1
jslancelot/.gitignore vendored
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@ -1 +0,0 @@
target

26
jslancelot/Cargo.toml
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@ -1,26 +0,0 @@
[package]
name = "jslancelot"
version = "0.8.10"
authors = ["Willi Ballenthin <william.ballenthin@mandiant.com>"]
edition = "2021"
homepage = "https://github.com/williballenthin/lancelot"
repository = "https://github.com/williballenthin/lancelot"
license = "Apache 2.0"
description = "Javascript bindings for Lancelot"
readme = "./README.md"
[lib]
crate-type = ["cdylib"]
[dependencies]
lancelot = { path = "../core", version = "0.8.10" }
anyhow = "1"
wasm-bindgen = { version = "0.2", features = ["enable-interning", "std"] }
js-sys = "0.3"
web-sys = { version = "0.3", features = ["console"] }
wee_alloc = { version = "0.4", optional = true }
console_error_panic_hook = "0.1"
[features]
# the default allocator is about 6k, wee_alloc is 1k
default = ["wee_alloc"]

202
jslancelot/LICENSE
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@ -1,202 +0,0 @@
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23
jslancelot/README.md
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@ -1,23 +0,0 @@
# Javascript bindings for Lancelot
## prerequisites
- [wasm-pack](https://rustwasm.github.io/wasm-pack/)
- [zig](https://ziglang.org/download/), v0.8.1 is known to work
## build
First, update the path to `zig` in `zcc`:
```sh
#!/bin/sh
/home/user/.bin/zig-linux-x86_64-0.8.1/zig cc -target wasm32-wasi $@
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ here
```
Then invoke `wasm-pack`:
```
CC="$(readlink -f zcc)" CXX="$(readlink -f zcc)" wasm-pack build --release --target web
```

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jslancelot/src/lib.rs
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@ -1,476 +0,0 @@
// clippy complains about `wasm_bindgen(typescript_type = ...)`
#![allow(unused_variables)]
use wasm_bindgen::prelude::*;
use anyhow::Error;
use lancelot::{
analysis::{
cfg,
dis::{self, zydis},
},
arch::Arch,
aspace::AddressSpace,
loader::pe::{PEError, PE as lPE},
module::ModuleError,
pagemap::PageMapError,
util::UtilError,
};
#[cfg(feature = "wee_alloc")]
#[global_allocator]
static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
#[wasm_bindgen]
pub fn version() -> String {
String::from("v0.8.0")
}
#[wasm_bindgen(start)]
pub fn main_js() -> Result<(), JsValue> {
#[cfg(debug_assertions)]
console_error_panic_hook::set_once();
Ok(())
}
// for better function signatures
// no functional difference.
type JsError = JsValue;
fn to_value_error(e: anyhow::Error) -> JsError {
js_sys::Error::new(&format!("{e}")).into()
}
fn to_js_err(e: Error) -> JsError {
match e.downcast_ref::<PEError>() {
Some(PEError::FormatNotSupported(_)) => return to_value_error(e),
Some(PEError::MalformedPEFile(_)) => return to_value_error(e),
None => (),
};
#[allow(clippy::single_match)]
match e.downcast_ref::<ModuleError>() {
Some(ModuleError::InvalidAddress(_)) => return to_value_error(e),
None => (),
};
match e.downcast_ref::<UtilError>() {
Some(UtilError::FileAccess) => return to_value_error(e),
Some(UtilError::FileFormat) => return to_value_error(e),
None => (),
};
#[allow(clippy::single_match)]
match e.downcast_ref::<PageMapError>() {
Some(PageMapError::NotMapped) => return to_value_error(e),
None => (),
};
to_value_error(e)
}
#[wasm_bindgen]
pub fn from_bytes(buf: Vec<u8>) -> Result<PE, JsError> {
let pe = lPE::from_bytes(&buf).map_err(to_js_err)?;
let dec = dis::get_disassembler(&pe.module).map_err(to_js_err)?;
let formatter = zydis::Formatter::new(zydis::FormatterStyle::INTEL).expect("valid formatter options");
Ok(PE {
inner: pe,
decoder: dec,
formatter,
})
}
#[wasm_bindgen]
#[derive(Clone, Copy)]
pub struct AddressRange {
pub start: u64,
pub end: u64,
}
#[wasm_bindgen]
impl AddressRange {
#[wasm_bindgen(getter)]
pub fn size(&self) -> u64 {
self.end - self.start
}
}
#[wasm_bindgen]
pub struct Section {
pub physical_range: AddressRange,
pub virtual_range: AddressRange,
// String are not clone, so we have to manually implement getters
permissions: String,
name: String,
}
#[wasm_bindgen]
impl Section {
#[wasm_bindgen(getter)]
pub fn permissions(&self) -> String {
self.permissions.to_string()
}
#[wasm_bindgen(getter)]
pub fn name(&self) -> String {
self.name.clone()
}
}
impl From<&lancelot::module::Section> for Section {
fn from(other: &lancelot::module::Section) -> Section {
Section {
physical_range: AddressRange {
start: other.physical_range.start,
end: other.physical_range.end,
},
virtual_range: AddressRange {
start: other.virtual_range.start,
end: other.virtual_range.end,
},
permissions: other.permissions.to_string(),
name: other.name.to_string(),
}
}
}
#[wasm_bindgen]
pub struct Instruction {
pub address: u64,
pub size: u8,
bytes: Vec<u8>,
string: String,
}
#[wasm_bindgen]
impl Instruction {
#[wasm_bindgen(getter)]
pub fn bytes(&self) -> Vec<u8> {
self.bytes.clone()
}
#[wasm_bindgen(getter)]
pub fn string(&self) -> String {
self.string.to_string()
}
}
#[allow(clippy::upper_case_acronyms)]
enum StringEncoding {
ASCII,
UTF16,
}
#[wasm_bindgen(js_name = "String")]
pub struct EncodedString {
encoding: StringEncoding,
pub address: u64,
pub size: usize,
string: String,
}
#[wasm_bindgen(js_class = "String")]
impl EncodedString {
#[wasm_bindgen(getter, typescript_type = "string")]
pub fn encoding(&self) -> JsValue {
match self.encoding {
// we expect these strings may be returned many times,
// so we intern them for perf
// https://docs.rs/wasm-bindgen/0.2.78/wasm_bindgen/fn.intern.html
StringEncoding::ASCII => JsValue::from(wasm_bindgen::intern("ASCII")),
StringEncoding::UTF16 => JsValue::from(wasm_bindgen::intern("UTF-16")),
}
}
#[wasm_bindgen(getter)]
pub fn string(&self) -> String {
self.string.to_string()
}
}
#[wasm_bindgen]
#[derive(Clone)]
pub struct Flow {
inner: lancelot::analysis::cfg::flow::Flow,
/* type: String,
* target: u64, */
}
#[wasm_bindgen]
impl Flow {
#[wasm_bindgen(getter, js_name = "type", typescript_type = "string")]
pub fn type_(&self) -> JsValue {
match self.inner {
// we expect these strings may be returned many times,
// so we intern them for perf
// https://docs.rs/wasm-bindgen/0.2.78/wasm_bindgen/fn.intern.html
lancelot::analysis::cfg::flow::Flow::Call(_) => JsValue::from(wasm_bindgen::intern("call")),
lancelot::analysis::cfg::flow::Flow::Fallthrough(_) => JsValue::from(wasm_bindgen::intern("fallthrough")),
lancelot::analysis::cfg::flow::Flow::UnconditionalJump(_) => {
JsValue::from(wasm_bindgen::intern("unconditional jump"))
}
lancelot::analysis::cfg::flow::Flow::ConditionalJump(_) => {
JsValue::from(wasm_bindgen::intern("conditional jump"))
}
}
}
#[wasm_bindgen(getter)]
pub fn target(&self) -> Vec<JsValue> {
use lancelot::analysis::{cfg::flow, dis::Target};
match self.inner {
flow::Flow::Fallthrough(va) => Vec::from([JsValue::from(wasm_bindgen::intern("direct")), va.into()]),
flow::Flow::ConditionalJump(va) => Vec::from([JsValue::from(wasm_bindgen::intern("direct")), va.into()]),
flow::Flow::Call(Target::Direct(va)) => {
Vec::from([JsValue::from(wasm_bindgen::intern("direct")), va.into()])
}
flow::Flow::Call(Target::Indirect(ptr)) => {
Vec::from([JsValue::from(wasm_bindgen::intern("indirect")), ptr.into()])
}
flow::Flow::UnconditionalJump(Target::Direct(va)) => {
Vec::from([JsValue::from(wasm_bindgen::intern("direct")), va.into()])
}
flow::Flow::UnconditionalJump(Target::Indirect(ptr)) => {
Vec::from([JsValue::from(wasm_bindgen::intern("indirect")), ptr.into()])
}
}
}
}
impl From<lancelot::analysis::cfg::flow::Flow> for Flow {
fn from(other: lancelot::analysis::cfg::flow::Flow) -> Flow {
Flow { inner: other }
}
}
#[wasm_bindgen]
#[derive(Clone)]
pub struct BasicBlock {
pub address: u64,
pub size: u64,
successors: Vec<lancelot::analysis::cfg::flow::Flow>,
instructions: Vec<u64>,
}
#[wasm_bindgen]
impl BasicBlock {
// Vec<Flow> cannot be serialized by wasm-bindgen
// so we have to manually convert to Vec<JsValue>
// and then annotate the TS type.
//
// NB: JS now owns the objects, must explicitly drop.
#[wasm_bindgen(getter, typescript_type = "Array<Flow>")]
pub fn successors(&self) -> Vec<JsValue> {
self.successors
.iter()
.cloned()
.map(Flow::from)
.map(JsValue::from)
.collect()
}
// Vec<u64> is not Copy so cannot be serialized by wasm-bindgen.
#[wasm_bindgen(getter)]
pub fn instructions(&self) -> Vec<u64> {
self.instructions.clone()
}
}
#[wasm_bindgen]
pub struct CFG {
basic_blocks: JsValue,
inner: cfg::CFG,
}
#[wasm_bindgen]
impl CFG {
#[wasm_bindgen(getter, typescript_type = "Map<BigInt, BasicBlock>")]
pub fn basic_blocks(&self) -> JsValue {
// ugh double copy
self.basic_blocks.clone()
}
pub fn get_reachable_blocks(&self, va: u64) -> Vec<u64> {
self.inner.get_reachable_blocks(va).map(|bb| bb.address).collect()
}
}
#[wasm_bindgen]
pub struct PE {
inner: lPE,
decoder: zydis::Decoder,
formatter: zydis::Formatter,
}
#[wasm_bindgen]
impl PE {
#[wasm_bindgen(getter, typescript_type = "string")]
pub fn arch(&self) -> JsValue {
match self.inner.module.arch {
// we expect these strings may be returned many times,
// so we intern them for perf
// https://docs.rs/wasm-bindgen/0.2.78/wasm_bindgen/fn.intern.html
Arch::X32 => JsValue::from(wasm_bindgen::intern("x32")),
Arch::X64 => JsValue::from(wasm_bindgen::intern("x64")),
}
}
#[wasm_bindgen(getter)]
pub fn base_address(&self) -> u64 {
self.inner.module.address_space.base_address
}
// not cheap, so its a function, not getter
#[wasm_bindgen]
pub fn functions(&self) -> Result<Vec<u64>, JsError> {
Ok(lancelot::analysis::pe::find_functions(&self.inner)
.map_err(to_js_err)?
.into_iter()
.filter_map(|f| match f {
lancelot::analysis::pe::Function::Local(va) => Some(va),
_ => None,
})
.collect())
}
// Vec<T> cannot be serialized by wasm-bindgen
// so we have to manually convert to Vec<JsValue>
// and then annotate the TS type.
//
// NB: JS now owns the objects, must explicitly drop.
#[wasm_bindgen(getter, typescript_type = "Array<Section>")]
pub fn sections(&self) -> Vec<JsValue> {
self.inner
.module
.sections
.iter()
.map(Section::from)
.map(JsValue::from)
.collect()
}
#[wasm_bindgen]
pub fn read_bytes(&self, va: u64, size: usize) -> Result<Vec<u8>, JsError> {
self.inner.module.address_space.read_bytes(va, size).map_err(to_js_err)
}
#[wasm_bindgen]
pub fn read_insn(&self, va: u64) -> Result<Instruction, JsError> {
let mut insn_buf = [0u8; 16];
self.inner
.module
.address_space
.read_into(va, &mut insn_buf)
.map_err(to_js_err)?;
if let Ok(Some(insn)) = self.decoder.decode(&insn_buf) {
let mut out_buf = [0u8; 200];
let mut out_buf = zydis::OutputBuffer::new(&mut out_buf[..]);
self.formatter
.format_instruction(&insn, &mut out_buf, Some(va), None)
.map_err(|e| -> JsError { js_sys::Error::new(&format!("failed to format instruction: {e}")).into() })?;
Ok(Instruction {
address: va,
size: insn.length,
bytes: insn_buf[..insn.length as usize].to_vec(),
string: out_buf
.as_str()
.expect("disassembly should always be utf-8")
.to_string(),
})
} else {
Err(js_sys::Error::new("invalid instruction").into())
}
}
#[wasm_bindgen(typescript_type = "Array<EncodedString>")]
pub fn strings(&self) -> Vec<JsValue> {
let mut ret: Vec<EncodedString> = Default::default();
for (range, s) in lancelot::util::find_ascii_strings(&self.inner.buf) {
if let Ok(va) = self.inner.module.virtual_address(range.start as u64) {
ret.push(EncodedString {
encoding: StringEncoding::ASCII,
address: va,
size: range.end - range.start,
string: s,
});
}
}
for (range, s) in lancelot::util::find_unicode_strings(&self.inner.buf) {
if let Ok(va) = self.inner.module.virtual_address(range.start as u64) {
ret.push(EncodedString {
encoding: StringEncoding::UTF16,
address: va,
size: range.end - range.start,
string: s,
});
}
}
ret.sort_by_key(|string| string.address);
ret.into_iter().map(JsValue::from).collect()
}
#[wasm_bindgen]
pub fn cfg(&self) -> Result<CFG, JsValue> {
use lancelot::aspace::AddressSpace;
let ret = js_sys::Map::new();
let mut insns: cfg::InstructionIndex = Default::default();
let functions = lancelot::analysis::pe::find_function_starts(&self.inner).map_err(to_js_err)?;
for function in functions.iter() {
insns.build_index(&self.inner.module, *function).map_err(to_js_err)?;
}
let mut cfg = cfg::CFG::from_instructions(&self.inner.module, insns).map_err(to_js_err)?;
lancelot::analysis::pe::noret_imports::cfg_prune_noret_imports(&self.inner, &mut cfg).map_err(to_js_err)?;
for bb in cfg.basic_blocks.blocks_by_address.values() {
// estimate each instruction is 2 bytes, which is probably too conservative,
// but enough to hint the allocation here.
//
// supported by here: https://ieeexplore.ieee.org/document/5645851
// > The results show that the average instruction size length is about 2 bytes.
let mut instructions = Vec::with_capacity((bb.length / 2) as usize);
let buf = self
.inner
.module
.address_space
.read_bytes(bb.address, bb.length as usize)
// programming error: this BB range must exist.
.expect("failed to read bb range");
for (offset, insn) in lancelot::analysis::dis::linear_disassemble(&self.decoder, &buf) {
if let Ok(Some(_)) = insn {
let insnva = bb.address + offset as u64;
instructions.push(insnva);
}
}
ret.set(
&JsValue::from(bb.address),
&JsValue::from(BasicBlock {
address: bb.address,
size: bb.length,
successors: cfg.flows.flows_by_src[&bb.address_of_last_insn].to_vec(),
instructions,
}),
);
}
Ok(CFG {
inner: cfg,
basic_blocks: ret.into(),
})
}
}

3
jslancelot/zcc
View file

@ -1,3 +0,0 @@
#!/bin/sh
/nix/store/qzabcrp41h1shjaj0j0w8g9pzx0dh68y-devshell-dir/bin/zig cc -target wasm32-wasi $@